I have a 2000 F350 dually crewcab 4x4 with 4.10 gears and the automatic 4 speed transmission. My truck full of fuel, with the hitch in the bed and me behind the wheel tips the scale at 8185 pounds. The GVWR for the truck is 11,200 pounds, CGVWR is 20,000 pounds.
If your truck is a regular cab or extended cab, the weight of your truck will be a little lower than my truck's weight.
With just me in the truck, I can handle up to 3,015 pounds of pin weight and a max trailer weight of 11,815 before I am at the the specified limits of the truck. I hope this helps.
Don Z.
2000 F350 Crew Cab Dually 7.3 PSD,Banks Stinger Plus,Line-X Liner,Prodigy Controller,Reese Signature Series 18K hitch